Core Recommendations:

The anterior-posterior renal pelvic diameter (APRPD) is the preferred measure to characterize the severity of urinary tract (UT) dilatation. The likelihood of resolution of a urinary tract dilation is related to the APRPD at initial diagnosis.

The term “UT dilatation” should be used consistently. The use of non-specific terms (e.g. hydronephrosis, pyelectasis, pelviectasis, uronephrosis, UT fullness or prominence, and pelvic fullness) should be avoided.